随着互联网技术的快速发展和日益成熟,宽带接入技术早已“平民”化,飞入各家寻常百姓。如大家常用的基于现有电话双绞线的宽带接入方式——ADSL,能够满足网民上网聊天、浏览新闻、收发邮件等需求。但随着视频点播和网络电视走进大家的生活,ADSL 所提供的带宽资源已经远远不够了。毕竟 ADSL 只提供8M 的下行和800K With the rapid development of Internet technology and increasingly sophisticated, broadband access technology has long been “civilian”, into the ordinary people. As we commonly used based on existing telephone twisted pair broadband access - ADSL, to meet the Internet users chat, browse the news, send and receive e-mail and other needs. But with the video on demand and network television into everyone’s life, ADSL provides bandwidth resources are far from enough. After all, ADSL only provides 8M downstream and 800K